Find the ratio between the fourth proportional of 12, 16, 6 and the third proportional of 4, 6.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 8 : 9
We know that the product of extremes is equal to the product of means.
Let the fourth proportional of 12, 16, 6 is x.
⇒ 12 × x = 16 × 6
⇒ x = 8.
Let the third proportional of 4, 6 is a
⇒ 4/6 = 6/a
⇒ a = 36/4
⇒ 9
Required ratio = 8 : 9.